Airplane lift dolly



Nov. 21, 1944. c. P. BAUM' ,36

AIRPLANE LIFT DOLLY Filed June 1, 1943 5 Sheets-Sheet 1 V w INVENTOR EQEQQ g CLEOPHAS PHILEMON BAuM 2 Era 1 BY ATTORNEY Nov. 21, 1944. Q B U 2,362,981

. AIRPLANE LIFT DOLLY Filed June 1, 1943 5 Sheets-Sheet 3 INVEN'II'OR CLEOPHAS PHILEMON BAuM A'ITORN EY Nov. 21;-1944. c. P. BA'UM" 2,362,981"

AIRPLANE LIFT DOLLY Filed June 1,1943 5 Sheets- Shut 4 5 4 x I V 50 7 INVENTOR- CLEOPHAS PmLEMON BAuM ATITORNE Y- Nov. 21, 1944. c, P. BAUM 2,3623981 AIRPLANE LIFT DOLLY Filed June 1, 1945 ssneets-sneet 5 ATTORNEY OLEOPHAS PHILEMON BAuM dling;

- tires;

Patented Nov. 21, 1944 i e 3 1" v Lm'r. mana er-linemen Balms, w st areg'mai :Apolieati onJune 1',1s4sgssrmnm489367;

' GGfaiins: (o1. cu -65,4)

subject this in ventiom isi the. construcefi a suitable spotting doll y for use on; air:- craft cal-tiers: and in clbse quarters on: landing;

and irr lzrangars for movingc= airplanes" wound; and? into and? out of corr lpactz parking:

arrangements Some of essemtia'lt requi'ne memedr sushi (1011mm that m-n'm be operated: by one man, that metric-mesa airplane: wheelr sutstantially .iafientimrge the: airotherwise; that he movalolelrim amyw horizontal directiom. azmii'thazt ids-will: be: quickly releasabie; without causing". lateral or longitm zfinalmovement'of tlmkaimlanei.

These.ohiecis'ofzthes'subiecttdevieeris-to provide a dolly meet the? above requirements; aunt-wilt be simple :amii compact. im e construction.

yetssumciently ruggedl to. withstand rough A further objectlisztmoonstructras dolly whichisw adapted; 1201' embrace:'arml .quickly. na-iseone wheel; bntiwilli engage: only the-tire: and; will not contactanwothers part of the;ai rplane; .suchas the hub, axle, etc tand wtll 'not require any, spe-q; cialsfiattingsiadcled, tosthe ai-rplanegmh l-ifiting, pur- A. further. object is. tcibuim a, dolly; so that! it i may be applied from the outhoardside oteitl'ierv of the two conventional non-swivelling main wheels 01 an. ainplane without, endangering the operator by a. moving, propeller.- or obli'ging. to

crawl; under the. lower wing. of a conventional'bi plane.

Further. and; more specific. objects will become apparentwas the descriptions of the subject; 'd'e-r vices proceeds. Several. illustrative. forms. oii

these devices are shown in the accompanying drawings in'which,,

Fig"; 10 i-s an elevation thereof 1'1- i's-anenrP view of thisform;

- Fig. 1 2is a plan-view 'of afourth form offthe e i i Fig-".- -13"i's an-el'evatiorr thereof; Figjleisasplanview'ofa-fifth 'form; 1 5 is an end view thereof; and

' Fig-.- 16 i's an elevationofi this form; 1

Similar numerals are usedto designate corre-- spending" parts in the several forms and views ofthedrawings. v v t Anyone of" the devices "herein: disclosed has means for apply n apair oishoes to the-under side of 'a 'tire on an airplane,- one shoein: front- 0f tli'e 'point of tire' contact with the-ground; amtv the other in back of it; then lifting the tire on the ground by'mov-ing oneor both shoes;

In the-first form of'the device (Figs... 3 toa4e):t, the C frame I is mounted on casters; whiclr'aree swivelled t'o' turrrirr any directi'orrxin. response toy: I

wardlyr'and slightly upwardly in a; SC OOfiM-HgJmO tion by? means ofia lever: system- 6% operated; by; a,

gear sector I and pinion 8 through the hand crank". 5 The shoe 5 is equippediwitharollersm to avoid l friictiombetweem the shoe anditi'rel as the? latter isz scoopediupaonto the: stationary shoe-4:

Ef'gj.. 1} isa plan viewofione preferred; form of 7 construction having a rigid 0' frame for a base Y mounted'onicasters;

Fig. 2 is an elevation thereof; Fig; 3 is ahendwiewofthis. form'; Fig; 4is1a; detail. of a portion, of the operating levermechanismioithe above-mentioned form; Fig; 5"is'* a planview'of another form in which the'basic frame is made in two parts telescopically fitted together' for adjustment to. difierent-sized Fig; 6 an elevational viewishowing the relai of the shoe plates appliecf to the periphery o tri the in: its lowered? (full line) and raised. (broken; line) positions m the above rem; "Hg: 7' i's axr elevation of this form;

- VF13.8 isan'endWiew-thereof: I

Fig. 9 isratplarr ofa third form of the-device;

Thezleverage '6: is so arranged thatf'shoei: may be;

sufficiently to take-care of all sizes. of conventionahaimlanetires suchas e. g., 26- xii" up to;32" xiiincluding the streamline types;

The crank: 9: has: a'pawl, andzratchet' pinion; It for locking the leverage in. place. By' releasing;

thiszpawli'and; ratchet: the; wheel may be lowered; shozesc' t 5': are curved. tozpresvent; of the 1 tim sideways amatl'etting': it;

instantly slip off the shoes. a In the seeon'dztomn of theidevice the 6 memhe Ii is i: made of two-r parts telescopicallyconnected at: 1.2: for the. purpose of. adjusting: the: device: tot difii'erent-sizedi" tires; 1 only a comparativeltr smallfleveragemechanism 6 isz-necessaryr to acicommorljateall conventional sizes of. tires; The/leverage mechanisms 6! iyotthe parallelogizamftypeyoneof' the parallel levers having a: gear sector I operated: the worm 8/ through bev elled gear mechanism |a |4 -|5, the gear I5 being operated through a pawl and ratchet arduring the raising or lowering operation is negli- 1 gible. In either of the forms, the shoe 4, or 4',

may be rigidly mounted on its bracket, instead of being hinged as shown in the drawings. The form shown in Figs. 5 to 8 has casters 2 which are swivelled to turn in any direction, just as in the first form.

In using this form of device it is first rolled into position around a wheel, the handwheel I9 being turned for adjusting the distance between shoes to fit the tire, and then the lever IT is rocked back and forth to operate the threaded member 20 and the leverage mechanism through the double pawl and ratchet arrangement l6, which simultaneously actuates the telescopic connection to bring the shoes closer together, thereby lifting the tire. When the tire clears the ground by approximately one inch, it is ready to be moved in any desired direction.

In the third form, the C memberis composed of a pair of hinged L members |,-the joined ends of which are upwardly inclined and hinged together at the top. A threaded member 2!, having right and left-hand threads at its opposite ends, is threaded into correspondingly threaded nuts 22 and 23 swivelled to the inclined portions of the L members, and is turned by means of the. operating handle 24 through a pawl and ratchet'arrangement 25. The shoes 4" and 5" are mounted on the ends of hinged brackets 3" and 6", which are pivotally connected to links 26 and 21, the other ends of which are pivotally mounted on the L members I at 28 and 29 respectively. The shoe 5" may be provided with rollers I0" similarly shaped to those shown in the first form.

The operation of this form is similar to that of either of the other forms in that the device is first rolled into place around the wheel with the shoes in their lowermost positions and then by operating lever 24 the tire may be raised to a suitable level for moving in any direction de mounted at the middle of its side portion. The

pulley is provided with lines 3| and 32 running therefrom to the two shoes 4" and 5" which are mounted on hinged brackets. 3" and 6""respectively on the open ends of the 0 base. The pulley is operated through a gear reduction means by hand crank 33 which has a pawl and ratchet mechanism 34 for locking it in place. This form is equipped with casters that are swivelled to turn in any direction just as the other forms described above.

In the fifth form of my device the shoes are pivotally mounted on swingable arms 35 and 36 respectively which are hung on a common pivot 31 mounted on a bar 38 which is hinged at its ends by means of arms 39 and 40 to pivots 4i and 42 on a lever arrangement 43. This lever arrangement consists of a long lever arm 44 extending from these hinges in a V shape to form a common handle. Upright portions 45 are joined to the hinge ends of this arm at a right angle thereto and are braced by angular braces 46 to the sides of the V. At the lower end of the upright portions 45 are mounted casters swivelled to turn in any direction, similar to those used in the other forms of device. Another upright member 41 somewhat shorter than the other two is mounted at right angles on this arm near the apex of the V and is also equipped with a swivelled caster at its end. Thus in using this form of device it may be rolled into position with the shoes under the tire and the lever arm 44 lifted. Then by pulling the lever down the shoes will grip the tire and lift it until the arm reaches a horizontal position, whereafter it will be slightly lowered until the caster on the short upright member 46 reaches the ground. The mechanism is stabilized in this position because the casters on the long upright members will have reached a position on the opposite side of the vertical plane passed through the hinges 4| and 42 thus providing a moment at these hinges about the latter casters in the direction of the third caster due to the weight of the wheel, etc., acting on the hinges. The arms 35, 35 should be not longer than the radius of the smallest wheel to be raised, so as to avoid the possibility of slipping of the shoes circumferentially off the wheel.

In the construction of these devices the leverage system should be so designed that if the raising means is actuated by a short ratchet lever, requiring more than two strokes, or a hand crank, the maximum allowable effort applied at the end of the lever or crank shall be approximately 50 pounds. A lesser amount is desirable. If a long lever requiring two strokes or less is used, and

where the operator's weight may be used'to advantage, then the effort required may be increased to not over pounds.

It is obvious-that various modifications in form, dimensions and arrangement may be made without departing from the scope of this invention as defined by the appended claims.

This invention may be used by or for the Government of the United States for governmental purposes without the payment to me of any royalties thereon or therefor.

What is claimed is:

1. A lifting dolly composed of two opposed L members each having a horizontal shaft for one side of the L and arms inclined upwardly toward each other for the other side, the arms being hinged together at their upper ends, a bracket hinged on each of said shafts, said brackets being inclined downwardly toward each other and having swivelled castors near their ends, a shoe mounted on the lower end of each bracket adapted to slide under a wheel to be lifted, a link for pivotally connecting the lower end of each bracket to a point near the top of the inclined arm of the opposite L member so that as these arms are drawn toward each other the brackets will approach each other without modifying their angular relation, and self-locking means. for manually drawing said arms together or increasing the angle between them.

2. A lifting dolly composed of two opposed L members each having a horizontal shaft for one side of the Land arms inclined upwardly toward each other for the other side, the arms being hinged together at their upper ends, a bracket hinged on each'of said shafts, said brackets being inclined downwardly toward each other and having swivelled casters near their ends, a shoe mounted on the lower end of each bracket adapted to slide under a wheel to be lifted, a link for pivotally connecting the lower end of each bracket to a point near the' top of the inclined arm of the opposite L member so that as these arms are drawn toward each other the brackets members each having a horizontal shaft for one side of the L and arms inclined upwardly-toward each other for the other side, the arms being hinged together at theirupper ends, a bracket hinged on each of said shafts, said brackets being inclined downwardly toward each other and having swivelled casters near their ends, a shoe mounted on the lower end of each bracket adapted to slide under a wheel to-be lifted, a link for pivotally connecting the lower end of 'each bracket to a point near the top of the inclined arm of the opposite L member'so that as these arms are drawn toward each other the brackets will approach each other without modifying their angular relation, and self-locking means for manually drawing said arms together or increasing the angle between them, said means consisting of a horizontal shaft having right and lefton the inclined arms of the L members, and an mounted on the lower end of each bracket adapted to slide under a wheel to be lifted, a link for pivotally connecting the lower end of each bracket to a point near the top of the inclined arm of the opposite L member'so that as these arms are drawn toward each other the bracketslwill approach each other without modie fying their angular relation, and self-locking means for manually drawing said arms together or increasing the angle between them, said means consistingof a horizontalshaft having right and left-hand threaded portions at its ends working in correspondingly threaded nuts pivotally mounted on the inclined arms of the L members, and an operating lever hung over the center of said shaft for" turning it in either direction I through a reversible-pawl and ratchet connection, said shoes being grooved to prevent the wheel from slipping off while it is being moved about on the "dolly, at least one of said grooves being provided with groove shaped rollers for rolling contact with the wheel to eliminate sliding friction between the shoes and wheel as the shoes are moved relative to each other during raising or lowering operation. i

5. A lifting dolly composed of a 0 frame formed oftelescopingportions to adjust the disf tance between the open endsyof the C, swivelled casters for said frame, a shoe mounted on a bracket inside one of said. open ends, another shoe mounted inside the other of said open ends on a parallel lever system for translating said operating lever hung over the center of said shaft for turning it in either direction througha reversible pawl and ratchet connection, said shoes being grooved to prevent the wheel from slipping oil? while itis being 'moved about on the dolly.

4. A lifting dolly composed of two opposed L members each having a horizontal shaft for one side of the L and arms inclined upwardly toward each other for the other side, the arms being hinged together at their upper ends, a bracket hinged on each of said shafts, said brackets being i inclined downwardly toward each other and having swivelled casters near their ends, a shoe other shoe in an arcuate path for raising a wheel about which said dolly is positioned by pushing it over onto the other shoe, or conversely, for lowering it to theground, and self-locking means for manually operating said lever system.

6. A lifting dolly composed of a 0 frame formed of telescoping portions to adjust the distance between the open ends of the O, swivelled toasters for said frame,.a shoe mounted on a bracket insideone of said open ends, another about whichsaid dolly is positioned bypushing it over onto the other shoe, or conversely, for lowering it to the ground, and self-locking means for simultaneously'operating said lever system and telescopically adjusting the portions of said 0 frame to raise or lower said wheel.

CLEOPI-IAS PHILEMON BAUM. 

